2012MNRAS.419..452Z

Query : 2012MNRAS.419..452Z

2012MNRAS.419..452Z - Mon. Not. R. Astron. Soc., 419, 452-464 (2012/January-1)

Evolutionary models for double helium white dwarf mergers and the formation of helium-rich hot subdwarfs.

ZHANG X. and JEFFERY C.S.

Abstract (from CDS):

Recent surveys have demonstrated the existence of several short-period binary systems containing two white dwarfs. Following orbital decay by gravitational-wave radiation, such binaries are expected to merge at a rate of two or three per thousand years per galaxy. The consequences of such a merger depend on the individual white dwarf masses, but are believed to include helium-rich subdwarfs, R CrB stars, extreme helium stars and also AM CVn systems and possibly Type Ia supernovae.

Whilst the hydrodynamics of the merger process remains difficult to compute, it is possible to compute the evolution of a double white dwarf merger following the destruction of one component. In this paper, we describe the evolution following the merger of two helium white dwarfs. We examine three sets of assumptions concerning the distribution of debris material between a disc and a corona.

Our results demonstrate that a model comprising both fast accretion to form a (hot) corona and slow accretion from a (cold) debris disc can reproduce the observed distribution of helium-rich subdwarfs in terms of their surface temperatures, gravities, nitrogen and carbon abundances.


Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS

Journal keyword(s): stars: abundances - binaries: close - stars: evolution - stars: peculiar - subdwarfs - white dwarfs

Simbad objects: 38

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Number of rows : 38
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 Ton S 137 HS* 00 04 31.0012800744 -24 26 21.321904200   13.66 13.8     sdO8He4 33 0
2 Ton S 148 HS* 00 18 53.2163245368 -31 56 01.925829492   14.27 14.45     sdBC0.2VIHe37 14 0
3 JL 199 HS* 00 34 07.7459679312 -55 51 05.933690604   15.5       sdOHe 11 0
4 LB 3229 HS* 01 47 17.4641096904 -51 33 39.214012788   13.30 13.55     sdO9.5VIIHe39 17 0
5 MCT 0155-3710 HS* 01 58 01.4668425840 -36 56 21.345844092   15.08       sdO8He3 9 0
6 BPS CS 22190-0003 HS* 03 44 58.8250755048 -16 52 42.177140472 13.52 14.63 14.90     sdOHe 16 0
7 HE 0414-5429 HS* 04 15 30.2247283728 -54 21 58.605323616 13.40 14.67 15.12     sdO8VIIHe39 14 0
8 HZ 1 HS* 04 50 13.5220981656 +17 42 06.198493500   12.601 12.661     sdOHe 44 0
9 LB 1766 HS* 04 59 18.7820628456 -53 52 54.594838668 10.88 12.25 12.91     sdBHe 20 0
10 CD-31 4800 HS* 07 36 30.1950207312 -32 12 43.685045964 9 10.26 10.48 10.81   sdO8p 75 0
11 [CW83] 0832-01 HS* 08 35 23.8750279080 -01 55 52.679960652   11.19 11.51     sdOp 29 0
12 [CW83] 0904-02 HS* 09 07 08.1240247440 -03 06 13.987067328   11.72 12.25     sdO7.5VIHe39 40 0
13 PG 0914-037 HS* 09 17 15.5883022512 -03 53 56.000023080   14.93       sdOHe 14 1
14 PG 0956+021 WD* 09 58 50.5157308008 +01 47 24.166179060   16.05   16.1   DA3.0 47 0
15 PG 0958-119 HS* 10 00 42.5868055272 -12 05 59.230105008   13.84 14.05 14.28   sdO8VIIHe39 19 0
16 CD-24 9052 HS* 10 25 50.8981995408 -24 53 19.993653672   11.60 12.12 12.01   sdO 16 0
17 PG 1135-116 HS* 11 38 10.5713473824 -11 51 03.574348560   15.45       sdOHe 14 0
18 EC 11363-1641 HS* 11 38 54.5078119824 -16 58 12.311467320   15.16 15.43     sdOHe 8 0
19 HE 1136-2504 HS* 11 39 10.2231003744 -25 20 55.561030836   13.89 14.10 14.67   sdOHe 12 0
20 HE 1142-2311 HS* 11 44 50.1480166440 -23 28 18.466147488   15.40 15.52 15.66   sdOHe 8 0
21 PG 1203-108 HS* 12 05 56.5574673864 -11 05 28.216976424   15.69       sdOHe 10 0
22 HE 1238-1745 HS* 12 41 01.1118607776 -18 01 57.242438220   14.36 14.58 15.21   sdOHe 14 0
23 PG 1251+019 HS* 12 54 08.3239424832 +01 43 24.111086088   15.24       sdOHe 27 0
24 HE 1256-2738 HS* 12 59 01.3945837008 -27 54 18.765895284   16.9 16.46 16.2   sdOHe 22 0
25 PG 1258+012 HS* 13 00 59.2051279416 +00 57 11.766735576   16.6   16.7   sdOHe 31 0
26 HE 1310-2733 HS* 13 12 50.5865006472 -27 49 01.842181464   14.24 14.45 14.75   sdOHe 14 0
27 EC 13165-1834 HS* 13 19 16.9516685112 -18 49 51.651262524   16.6 16.29 16.6   sdOHe 9 0
28 HD 127493 HS* 14 32 21.4926471192 -22 39 25.646693688 8.64 9.74 10.08     sdOHe 110 0
29 EC 14466-1058 HS* 14 49 24.4156834752 -11 11 18.029512932   15 15.21     sdOHe 8 0
30 PG 1511-110 HS* 15 14 16.9962679704 -11 14 12.482699604   14.80 14.97 15.23   sdOHe 11 0
31 BPS CS 22955-0024 HS* 20 23 50.2879686360 -25 08 29.033493540 14.29 15.50 15.5     sdOHe 12 0
32 BPS CS 22940-0009 HS* 20 30 20.1694119096 -59 50 39.351355764 12.70 13.85 14.00 14.18   sdBC1VHe38 18 0
33 HE 2203-2210 HS* 22 06 29.3837853216 -21 55 59.664956520   15.04       sdOHe 10 0
34 PG 2204+071 HS* 22 07 14.4137003040 +07 22 32.153878416   14.51 14.73 15.15   sdB 35 0
35 BPS CS 22956-0094 HS* 22 16 56.0068153032 -64 31 50.157732684 12.27 13.34 13.38 13.50   sdB 18 0
36 PG 2258+155 HS* 23 00 57.7424130816 +15 48 40.451383800   15.03   15.6   sdB0.2VIIHe39 19 0
37 Ton S 103 HS* 23 34 01.9537039992 -28 51 37.963699704   14.43 14.66     sdBN0.2VIIHe40 20 0
38 HE 2347-4130 HS* 23 50 19.7137825608 -41 14 01.174503372   15.16       sdO8VIIHe39 11 0

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